1st 1/3 of make it dope, pimped out, extra insulated, tile floor or concrete, finished out. Maybe two bedrooms.
Other 2/3 workshop, garage. Keep tractor, boat, pickup, cars. Have myself a walkin deer cooler in there, oil change pit, engine hoist gantry, 40 linear ft of workbench across the front wall.
Fuggit go 40x100, add a paint booth on the end.
My stepfather did this with his most recent bldg. He put a 600 sq ft 2 story apartment on one end of the shop he built. When he decided not to move his operation into it and listed with a realtor it was under contract in less than 24 hours.